Name the element

1) First element in periodic table
2) Used in thermometers
3) Outer layer of US pennies
4) Found in milk
5) Most common in the atmosphere
6) Smells like rotten eggs
7) Named for the Greek word for sun
8) Has the symbol Zn
9) Diamonds are made of it
10) Malleable, ductile and valuable
11) Nutrient found in bananas
12) Used in a type of advertising signs
13) Extremely poisonous metalloid
14) Pipes made of these are being replaced
15) Argentina is name for it
16) Along with chlorine, it makes salt
17) Also the name of a "California valley"
18) Most common element in the human body
19) Bronze is made from copper & this
20) Element starting with "X"
21) Named for Germany
22) Has an atomic number of 12
23) It was painted on watch hands to make them glow, formerly
24) Comes between uranium & plutonium

All the answers are capitalized below :
1) First element in periodic table - HYDROGEN
2) Used in thermometers - MERCURY
3) Outer layer of US pennies - COPPER
4) Found in milk - CALCIUM
5) Most common in the atmosphere - NITROGEN
6) Smells like rotten eggs - SULPHUR
7) Named for the Greek word for sun - HELIUM
8) Has the symbol Zn - ZINC
9) Diamonds are made of it - CARBON
10) Malleable, ductile and valuable - GOLD
11) Nutrient found in bananas - POTASSIUM
12) Used in a type of advertising signs - NEON
13) Extremely poisonous metalloid - ARSENIC
14) Pipes made of these are being replaced - LEAD
15) Argentina is name for it - SILVER
16) Along with chlorine, it makes salt - SODIUM
17) Also the name of a "California valley" - SILICON
18) Most common element in the human body - OXYGEN
19) Bronze is made from copper & this - TIN
20) Element starting with "X" - XENON
21) Named for Germany - GERMANIUM
22) Has an atomic number of 12 - MAGNESIUM
23) It was painted on watch hands to make them glow, formerly - RADIUM
24) Comes between uranium & plutonium - NEPTUNIUM